directory.py
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	# Copyright (C) 2017-2018 The Software Heritage developers
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU Affero General Public License version 3, or any later version
	# See top-level LICENSE file for more information


	from django.shortcuts import render, redirect
	from django.template.defaultfilters import filesizeformat

	from swh.web.common import service
	from swh.web.common.utils import (
	reverse, gen_path_info
	)
	from swh.web.common.exc import handle_view_exception, NotFoundExc
	from swh.web.browse.utils import (
	get_directory_entries, get_snapshot_context,
	get_readme_to_display, get_swh_persistent_ids,
	gen_link
	)

	from swh.web.browse.browseurls import browse_route


	@browse_route(r'directory/(?P<sha1_git>[0-9a-f]+)/',
	r'directory/(?P<sha1_git>[0-9a-f]+)/(?P<path>.+)/',
	view_name='browse-directory')
	def directory_browse(request, sha1_git, path=None):
	"""Django view for browsing the content of a SWH directory identified
	by its sha1_git value.

	The url that points to it is :http:get:`/browse/directory/(sha1_git)/[(path)/]`
	""" # noqa
	root_sha1_git = sha1_git
	try:
	if path:
	dir_info = service.lookup_directory_with_path(sha1_git, path)
	# some readme files can reference assets reachable from the
	# browsed directory, handle that special case in order to
	# correctly displayed them
	if dir_info and dir_info['type'] == 'file':
	file_raw_url = reverse(
	'browse-content-raw',
	url_args={'query_string': dir_info['checksums']['sha1']})
	return redirect(file_raw_url)
	sha1_git = dir_info['target']

	dirs, files = get_directory_entries(sha1_git)
	origin_type = request.GET.get('origin_type', None)
	origin_url = request.GET.get('origin_url', None)
	if not origin_url:
	origin_url = request.GET.get('origin', None)
	snapshot_context = None
	if origin_url:
	try:
	snapshot_context = get_snapshot_context(None, origin_type,
	origin_url)
	except Exception:
	raw_dir_url = reverse('browse-directory',
	url_args={'sha1_git': sha1_git})
	error_message = \
	('The Software Heritage archive has a directory '
	'with the hash you provided but the origin '
	'mentioned in your request appears broken: %s. '
	'Please check the URL and try again.\n\n'
	'Nevertheless, you can still browse the directory '
	'without origin information: %s'
	% (gen_link(origin_url), gen_link(raw_dir_url)))

	raise NotFoundExc(error_message)
	if snapshot_context:
	snapshot_context['visit_info'] = None
	except Exception as exc:
	return handle_view_exception(request, exc)

	path_info = gen_path_info(path)

	breadcrumbs = []
	breadcrumbs.append({'name': root_sha1_git[:7],
	'url': reverse('browse-directory',
	url_args={'sha1_git': root_sha1_git})})
	for pi in path_info:
	breadcrumbs.append({'name': pi['name'],
	'url': reverse('browse-directory',
	url_args={'sha1_git': root_sha1_git,
	'path': pi['path']})})

	path = '' if path is None else (path + '/')

	for d in dirs:
	if d['type'] == 'rev':
	d['url'] = reverse('browse-revision',
	url_args={'sha1_git': d['target']})
	else:
	d['url'] = reverse('browse-directory',
	url_args={'sha1_git': root_sha1_git,
	'path': path + d['name']})

	sum_file_sizes = 0

	readmes = {}

	for f in files:
	query_string = 'sha1_git:' + f['target']
	f['url'] = reverse('browse-content',
	url_args={'query_string': query_string},
	query_params={'path': root_sha1_git + '/' +
	path + f['name']})
	if f['length'] is not None:
	sum_file_sizes += f['length']
	f['length'] = filesizeformat(f['length'])
	if f['name'].lower().startswith('readme'):
	readmes[f['name']] = f['checksums']['sha1']

	readme_name, readme_url, readme_html = get_readme_to_display(readmes)

	sum_file_sizes = filesizeformat(sum_file_sizes)

	dir_metadata = {'id': sha1_git,
	'number of regular files': len(files),
	'number of subdirectories': len(dirs),
	'sum of regular file sizes': sum_file_sizes}

	vault_cooking = {
	'directory_context': True,
	'directory_id': sha1_git,
	'revision_context': False,
	'revision_id': None
	}

	swh_ids = get_swh_persistent_ids([{'type': 'directory',
	'id': sha1_git}])

	heading = 'Directory - %s' % sha1_git
	if breadcrumbs:
	dir_path = '/'.join([bc['name'] for bc in breadcrumbs]) + '/'
	heading += ' - %s' % dir_path

	return render(request, 'browse/directory.html',
	{'heading': heading,
	'swh_object_id': swh_ids[0]['swh_id'],
	'swh_object_name': 'Directory',
	'swh_object_icon': 'fa fa-folder',
	'swh_object_metadata': dir_metadata,
	'dirs': dirs,
	'files': files,
	'breadcrumbs': breadcrumbs,
	'top_right_link': None,
	'readme_name': readme_name,
	'readme_url': readme_url,
	'readme_html': readme_html,
	'snapshot_context': snapshot_context,
	'vault_cooking': vault_cooking,
	'show_actions_menu': True,
	'swh_ids': swh_ids})

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